Sparking plug.



QUnire Sfrarrns lfafrsrrr Fries.

CHARLES A. MEZGER, OF BROOKLYN, NEXV YORK, ASSIGNOR TO MINNIE MEZGER, OF BROOKLYN, NEV YORK.

SPARKENG PLUG.

SPECIFICATION forming part of Letters Patent No. 700,147', dated May I 3, 1902.

Application filed March 25,1902. Serial No. 99,902. (No model.)

To all whom it may concern.:

Beit known that l, CHARLES A. Mnzenn, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, inthe county of Kings and State of New York, have invented a new and Improved Sparking Plug, of which the following is a full, clear, and exact description.

The object of this invention is to prevent sooty formations within the cylinder of an intornai-combustion engine from accumulating around the sparking points in such a manner as to short-circuit the igniter.

This specification is an exact description of one example of my invention,while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is an exterior view of the sparking plug. Fig. 2 is a longitudinal section thereof. Fig. 3 is a section on the line 3 3 of Fig. 2, and Fig. 4- is a section on the line l 4 of Fig. 2.

a indicates the plug propeigwhich is formed of metal and screwed or otherwise fastened into the walls l) of the cylinder, as will be un derstood.

a' indicates one of the sparking points, which point is carried by the plug a within the cylinder. The other sparking point is formed by a rod c, of suitable material, having nuts c at its outer end for the connection of the wire thereto. plug a is formed a chamber aoommunicating with the cylinder, and in the outer part is formed a chamber a3, opening at the outer end of the plug. rlhese chambers are connected by a reduced central passage c4. Through the passage a extends a tube d, of hard insulating material, the tube having an annular shoulder cl,bearing against the inner end wall of the chamber a2. Beyond the shoulder d' the insulating -tube d is extended to form a tubular shell dwhich extends through the chamber d?, slightly inward beyond the same. rlhe rod c passes through the tube CZ and through the tubular shell e.- thereof and projects inward beyond this shell opposite Jthe sparking point a.

On the rod ois formed an In the inner part of the annular shoulder c2, and this shoulder bears against an internal shoulder d3 on the tube (l at the outer extremity of the shell (Ftheroof.

c indicates a porcelain or other non conducting cap, which is set in the chamber a3, and against which the pressure of the nuts c' is exerted, the rod c passing through the cap c.

f and f' indicate gaskets, of yielding nonconducting material,set between the cap e and the plug a and between the exterior flange CZ and the cap to keep the parts properly spaced and to prevent the unyielding pressure of the nuts on the porcelain or other frangible parts.

Vhen the nuts c are screwed up tightly, the collar or shoulder c2 on the rod c is forced against the shoulder (Z3 of the tube (l and this tube is drawn firmly outward, thus pressing its exterior shoulder (lf against the gasketf and th rough the medium of this gasketagainst the inner wall of the chamber @2in the plug a. By means of the shell cl2 an annular barrier is formed completely around that part of the sparking point c which is exposed to the sooty accumulation Within the cylinder, this shell lyingin the chamber o? and being spaced from the walls thereof and from the sides of the sparking point c and leaving only the extremity of said sparking point exposed, so that it may have the propercoaction with the sparking point a'. It will therefore be seen that in order that the electric current may pass between the contact-points in any other manner than in the way in which it is intended this current will have to move along the outer side of the shell cl2 and thence over the edge and inward along the inner side of the shell to the collar or enlargement c2. This makes a long path, and owing to such length and to the poor conducting qualities of the soot thc above-mentioned short circuit is prevented. lli/ere it not for this shell, arranged in the manner explained, the current could pass readily from the walls of the chamber a2 across to the rod c, and short-circuiting would therefore be of frequent occurrence. It is this disadvantage that my invention overcomes.

Various changes in the form and details of my invention maybe resorted to at willwithout departing from the spirit thereof. Hence IOO l consider myself entitled to all forms of the invention as may lie Within the intent of my claims.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patentl. The combination of a chambered plug having a sparking point thereon, an elongated conductingmember forming the second sparking point and projected through the chamber and extending adjacent tothe sparking point, and a tubularshell arranged in the chamber of the plug and spaced from the Walls thereof and from the sides of said elongated member forming the second sparking point, for the purpose specified.

2. The combination of a chambered plug having a sparking point thereon, an elongated conducting member projected through the chamber and extending adjacent to the sparking point, a tubular insulating-shell arranged in the chamber of the plug and spaced from the Walls thereof and from the sides of said elongated member forming the second sparking point, for the purpose specified, an insulating-tube at the base of the insulating-shell, and means for holding the said elongated conducting member snugly within the shell and tube.

The combination of a chambered plug havinga sparking point thereon,an elongated conducting member projected through the chamber and extending adjacent to the sparking point, a tubular shell arranged in the chamber of the plug and spaced from the walls thereof and from the sides of said elongated member forming the second sparking point, for-the purpose specified, an insulating-tube at the base of the said insulatingshell, and means for holding the said elongated conducting member snugly Within the shell and tube, said means comprising an insulated cap bearing against the plug and a nut Working on the outer end ofthe said elongated condueting member.

4. An electric igniter, comprising an elongated member formiug a sparking point, and an insulating-shell inclosing the major portion of the exposed part of said elongated member, the said shell having an open space around its outer side and between its inner side and Jdie said elongated member.

5. The combination of a plug proper having a chamber therein and aredueed passage leading therefrom, an insulating-tube placed in the said passage and having a shell-like extension projected into the chamber of the plug and spaced from the interior Walls thereof, and a rod projected through the tube and through the shell, said rod being spaced from the inner Walls of the shell, for the purpose speciied.

G. The combination of a plug proper having achamber therein and a reduced passage leading therefrom, an insulating-tube placed in the said passage and having a shell-like extension projected into the chamber of the plug and spaced from the interior walls thereof, a rod projected through the tube and through the shell, said rod being spaced from the inner walls of the shell for the purpose speeiiied, and being formed with an enlargement engaging a shoulder at the outer end of the shell, and means for exerting an outward pressure on the rod to hold the parts snugly engaged.

In testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES A. illEZGlClt.

Ytitnesses:

isAAo B. OunNs, EvEnM-m BOLTON MARSHALL. 

